Add support to show images in markdown preview. Set missing base to

use relative paths for loading images

Author: Chris2011

ide/markdown/src/org/netbeans/modules/markdown/MarkdownViewerElement.java

@@ -243,6 +243,7 @@ public void updateView() {
                 HTMLEditorKit kit = (HTMLEditorKit) viewer.getEditorKit();
 
                 HTMLDocument doc = (HTMLDocument) viewer.getDocument();
+                doc.setBase(dataObject.getPrimaryFile().getParent().toURL());
 
                 // Would be better to create some diff and update the changed elemets
                 doc.remove(0, doc.getLength());